As the region grapples with unique environmental and social challenges, collaboration between governments, private sector entities, and international organizations is essential to mobilize the necessary capital and expertise. A deep dive into how public-private collaborations can mobilize funds for large-scale sustainable initiatives in the Caspian Sea region. It provided innovative financial models, risk-sharing mechanisms, and policy frameworks that are aiming to unlock new opportunities for investment and foster a resilient, green economy in the Caspian region.